Machine for cutting toothed gearing.



No. 886,398. PATENTED MAY 5, 1908.

` G.y NARDIN.

MACHINE FOR GUTING TOOTHED GEARING.. AYPLIQATION FILED MAR.2a.1sov.

s SHEETS-SHEET 1.

FIG l BATENTBD MAY 5,1908.

l G. NARDIN. v MACHINE FOR CUTTING TCOTHED GEARINC.

APPLICATION FILED MAB..28.1907.

3 SHEETS-SHEET 24 TFIETEQ vlnr/105.5553 C l l Y//vvEA/T'OR No. 886,398. l PATBNTED MAY 5,1908.

` G. NARDN.

MACHINE POR CUTTING TOOTHED GBARING.

APPLIOATION FILED 1&1AR.za.1s\o7.V

SHEETS-SHEET 3.

theY machine for cuttin toothed GEORGES NRDIN, OF PARIS,

FRAN CE,ASSIGN O'R`OF ON E-HALF TO` THE FIRM OF ATELIERS DE CONSTRUCTIONS MCANIQUES (1I-DEVANT DUCOMMUN, OF MLHAUSEN, ALSACE,

GERMANY.

No. 886,398. Specification of Application filed March 28 To all whom 'it may concern:

Be it known that I, GEORGES citizen of .the French Republic, and resident of Paris, France, engineer, have invented new and useful Improvements in Machines fior Cutting Toothed Gearing, of which the Vfollowing is a full, clear, and exact description.

This invention relates to improvements in gearing, especially bevel gearing, orniing the subject of a former patent No. 831234 and is based on the rinciple of cutting by the relative rolling of t e wheel blank, to two ad'ustable shaping tools,` forming between t em a space with straight flanks and which upon a relative movement between them and the wheel blank transversely to the axis of the latterare designed to shape simultaneously the two gearing flanks of-a tooth at once, and that with the requisite convergencefor bevel wheels.

In the former arrangement such as is described and shown in the said patent the elevation of each tool carriage to the base of the tooth or of the space takes place separately and this might give rise to faults or ditferences. In the said improved machine, not only has it been sought to avoid these faults but the regulation of the adjustment of the elevation of the tool carriages is simplified and madeA exact. Further, the improvements allow of dispensing with the shafts which inthe former construction carried the guides for the tool carriages and by means of which thenseparate elevation of the latter is NARDIN, a

effected, the said shafts being cumbersome and sometimes interfering with the rolling of the wheel blank. y

The principal feature of the new arrangement is that the guides for the tool carriages instead of being carried by the pivoting shafts are carried by a common base of cradle form resting in a recess curved, for this purpose, in the frame of the machine and provided with an adjusting arrangement for imparting a precise angular displacement to the said cradle baseso 'as to raise the guides of the tool carriages at once or together in the same plane with the object of allowing an exact 1 and simultaneous elevation of both tools to take lace, while vdispensing with the pivotk ing s afts supporting the carriage guides in the former arrangement.

This important improvement, as well as MACHINE FOR CUTTING TOOTHED GEARING.

be cut with regard to I Letters Patent.

, i907. serial No. 364,984.

Patented May 5, 1908.

l other innovations, which appear in the mal chine described in the said former atent i will be better understood bythe fol owing description reference being made tothe accompanying drawings, in which: l Figure 1 is a vertical cross section of the i improved machine. Fig. 2 isa plan, part in Iihorirontal section, some arts such as the g puppet for the wheel blan l caring sector being omitted for sake of clearness. Fig. 5 right angles to that shown in Fig. 1. l and 5 relate to details, Fig. 4 showing the arrangementof guiding levers for correctly i controlling the rolling of the wheel blank and E Fig. 5 showing in plan the cradle base sup- 'porting the guides for the 'tool carriages. Fig. 6 illustrates diagrammatically the mounting of the said cradle and shows how, by means ofthe latter, both tools can at once be accurately adjusted to the required elevation.

l and 2 indicate the two parallel shaping l tools, carried in a vertical position by the l sliding carriages 3, 4, and together forming a toothspace with straight flanks, (F ig. 3).

The carriages 3, 4 are guided by the cari riageguides 5, Gand actuated in a similar i manner to that described in the said patent l by means of an oscillating lever 7, pivoted on the shaft 8, and the u per arm of which is connected by means ofp jointed rods 9 and a ,sliding block 10 adjustable by la regulating screw, to the tool carriages 3, 4 and thelower arm of which receives motion from the crank driving shaft 1 3 is a vertical section at Figs.4

and the' puppet I The carriage guides 5, 6 rest with their seg- A mental base (see Fig. 5) upon the cradle base l 12 which has give free play to the upper arm of the oscillating lever 7 and to the parts which. connect it to the tool carriages. The cradle base A12 rests in a curved recess 13 ofcorresponding form in the frame of the machine and the curvature bf which is clearly' shown in Figs. 1 and 6. In this recess, the cradle base 12 can f be angularly displaced with the object of sil multaneously raising the tools 1, 2, according ,l to the depth of the tooth to be'cut; the said displacement can be eii'ected by means of a l screw threaded rod 14 connected at 15 to the i cradle base and of a screwed sleeve 16 prol vided with an operating knob 1'7 and hel-d so that it can turn, without being displaced longitudinally in a lhinged block 18.

a wide slot in its middle part to base.

Thecradle base 12 is provided, on the upper side with a graduated plate 19 movab e iniregard to a fixed scale 20 and allowing of the exact angular adjustment of the cradle This latter can be secured in all-positions of adjustment by lmeans of the two shafts 38 (Fig. 3) each provided with anteccentric end 39 having a block 4() engaging a curved slot 40a in the cradle base and which by angular displacement can-be caused to exert on the cradle base a locking pressure sufficient to render it immovable 1n its curved seat. 1

The carriage guides 5 and 6 are each fixed to the cradle base l2 by means of two locking bolts 21 (Figs. 2 and 5) passing through the curved'slots 22 in the segmental base of the respective carriage guides, which allows of giving tothe guide carriages 5 and 6 the necessary conver ence for cutting bevel'wheels, or a arallel direction for the cutting of spur Whee s. Graduated scales 23, 24, (Fig. 5) serve to facilitate the determination of the angle of convergence required.

The Wheel blank 25 is carried by a puppet having a dividing arrangementwhich is also an improvement on tlie aforementioned patent and comprises a stem forming a mandrel 26 which is adjustable in a barrel 27 and provided with a washer 28, between which and the end of the barrel the body of the wheel blank is held owing to an upper screw thread With a locking nut 41, with which the stem or mandrel'is provided. The barrel 27 carrying the mandrel is held in a rotary cylinder 29 supported in a sleeve portion 30 of a casing 31 inclosing the dividing arrangement which com rises a dividing toothed wheel 32 fixed ont e cylinder 29 and a Worm 33 gearing with this said dividing Wheel, by the rotation of which the cylinder 29 with the barrel 27 carrying the mandrel and the Wheel body may be made to turn -through a determined angular distance, when it is required to cause the body of the Wheel to turn on itselfl for the purpose of cutting a new tooth.

The barrel 27 carr 'ng the mandrel is longitudinally ad'justabe1 in the cylinder 29 for placing thewheel body in position, by means of a screw threaded portion 34 with which it is provided and which carries a-sleeve-like nut 35 capable of turning, but which cannot be moved longitudinally, this sleeve-like nut being provided With an operating handle. A longitudinally extensible ring) 37 is interposed between a iange on the arrel 27- and a ange on the cylinder 29. The whole of this pu pet having a dividing arrangement is carrie by the sleeve portion 30, in a bearing 36 of a u pet bearing sector 45 which can be an ar y displaced in theIvertical plane for adJusting the inclination ofthe mandrel carryin the Wheel, bein pivoted (Fig. 3) .to a brac et'46, in front o which the said sector can be adjusted by means of a Worm 47 on` the bracket.

The accurate adjustment of the puppetcarrying sector scale 50 facilitates this adjustment) the pupet carrying sector can be iixed in posltion y thelocking bolts 51 (Fig. 3) en aging with a hook behind a shoulderon the racket 46'. The bracket 46 is mounted upon a horizontal circular rail on the frame of the machine so other-with relation to the tools, in passing in 54 and a worm 55, actuated in a well known ated through the medium 'of a heart-shaped cam 60 and a ste ped uponthe driving s aft 1 The feeding worm shaft 55"L is provided is provided with a ooved pullcy 634 connected by a strap or elt when a tooth has been cut. This transmission is combined with atoothed clutch of which the movable sleeve '65, mounted by means of a key and keyway on the worm shaft 55a enters into engagement Withthe loose ratchet Wheel of the ratchet gear 56 when cutting of a tooth takes place, While for the rapid return of the bracket 46 after the said cutting, the clutch sleeve 65 is coupled with the grooved pulley 63 for transmitting the rotary movementfrom the latter'to the worm shalt 55, the ratchet gear bein disengagfed as regards the control of sai Worm s 1a t.

66 by having a handle 67 for Working 1t by hand; it is worked mechanically b means of the tappets 103, 104, (Fig. 2) whic are movery ofthe base of the bracket 46 (Fig. 3).

The rolling of the wheel blank for cuttin each. tooth is effectedy durin the rotation o the bracket-16, by means. o two arc shaped as in the said former patent, which embrace with their forked end (Fig. 4) a pin 72 carried by an arc shaped arm 73 fixed tothe casing 31 of the dividing arrangement by means of `the latter gearing lwith a curved rack 48- on 45 being eected (a vernier 70 termittent movement from one side 'to the as front of them; the tools, in this travel of the j Wheel, effect the cutting of its teeth.- The said movement is edected by means of a rackmanner, by a ratchet arrangement 56 com" trolled by a system of levers 57, '58, 59, 'actuwith a crank handle 62V (Figs. 2 and 3) for op-. erating itby hand if required. Moreover, it A The displacement of the clutch sleeve 65 can be efl'ected by means of the operating rodv` l 75 that it can turn in a horizontal plane, with all pulley 6 1 mounted 64 to the pulley 61., this transmission being adapted to produce' 160 the automatic rapid return of the bracket 46 able in a circular groove made in the periphguidmr levers 70, 71, on the same prlnciple CII `termi ttent rotation of the w puppet carrying. the wheel. The 70, 71, are pivoted to a curved fixed bar 74 in such a manner that their pivotal pointcan be ad'usted along the said bar.v To this end, each lever is held by a double clamp 75 (Figs. 2 and 4) hinged b a pivot 76 to a slide block 77, adjustaby carried by the Xed -bar 74 and which can be-moved thereon when required carrying with it thesaid double clamps 75, so as to change the osition of the pivotal point'of the lever. T e arc sha ed arm 73 is controlled by one or the ot er of two spiral springs 80 (each of which acts for an active rollin movemeht in one direction); Thee'ecto this arrangement of guiding levers is as follows: When the bracket 46 with the puppet-carrying sector is caused to turn step by step in a horizontal plane', the arc shaped arm 73 is carried along andas it 1s supported by means of the pin 72 at thev bottom of the fork of one of the levers 70, 71

(the lever 70 Fig. 4) it is compelled to turn' at the same time and therebj` produce an -ineel blank around its own axis, at the same time that it is interi I mittently advanced in front-of the shaping tools, transversely to the movement of the latter so that acombined movement is rotact of the circ sidered vwhat when a circle rolls upon a Hat duced or an intermittent rolling of the w eel blank in front of the shapingl tools, or in other words, a ear-like engagement of the wheel blank wit the cutting tools, thecontrol of the bracket 46 bein effected in such a manner that the latter sha l only be advanced when the tools come out of touch with thel wheel blank. In therst'half of this rolling v b movement, starting ,from the position shown in Fig. 4, the pin 72, Asupported bythe lever the springs 80, will folat theniiddle o the c urse at l91, tothe fork of the lever 7l and then ind its support in thelatter, always/under the action `of the spring which 's in play soas to describe t e symmetric arc-s aped path 92', these 'two paths corres ondingl in shape to the cycloldal arcs ro( uced by the polnt of cone of originof the wheel blank which will be understood when it is coni path the point of contact describes v cycloidal Y curves and inversely the moment the point of contact of the circle of ori in of the wheel blank describes `two cycloidalg of the latter is perfect.v

'i that the two levers 70, 71 oscillate, in the roll# ing movement ofthe wheel blank between the arcs the rolling It` is understoo position represented in Fig. 4 and the position in which the in 72 coincides with the middle 91 of the "{ed bar .74`. The curvature ofthe path that .the pin 7 2 describes may be varied to a certain extent by vchangling the positionY of the guiding levers hollow screws 102. cross section 1n Figi'. 2..

versely to pivotal point of the gulde levers 70, 71 on theiixed bar '74. For this adjustment and for other controlling purposes the levers 70, 71 are preferably' rought into a position in which the cides with the middle 91 of the bar which it can be xed by passed through a socket point in the said bar. l i

The pin 72is adjustable in the slot of the arc shaped arm 73. To this end, it is carried bya slide 100 (Fig. 1) guided in the slot of the said arm and adapted to be fixed thereto by means of a clamping 'above the 'edges of the slot and capable of 4being secured in position by means of two The slide 100 is shown in To a tail on this slide are adjustab y attached the spiral springs 80 only one of which acts at a t'me to assist in causing the wheel blank toro l.

' 105,(Fi 1) is an adjustable stop for vthe wheel blan.

What I claim is:

pin. coin- 74 and in a locking pin 1. In a machine for cutting toothed Wheels, i

especially bevel wheels, on the rolling principle, the combination with two sha ing tools together forming a tooth space with) straight Hanks, movable carriagesv for these tools, guides for these tool carriages, a ing pujpplt and a device for producing a relative ro g movement between this wheelbearing pu pet and the shaping tools transversely to t e slidin movement of the latter, of a common base or the guides of the tool carriages, aseat in the frame of the machine to receive this base and an adjusting device for 'giving an Vangular displacement to said ase sof as to cause tlieelevation of the toolcarriage guides at once or' to ether in the same plane, with the object 0% allowing an exact. and simultaneous elevation of both tools,- substantiallyas hereinbefore described.

2. In a machine for cutting toothedwlieels,

especially bevel wheels, on the .rolling prin. ciple, the combination with two sha ing tools -together forming a tooth space with) straight Hanks, movable .carriages for these tools, guides for these tool carriages, a wheel-bearmg Pup 96. provided at this plate 101, projecting wheel-beart and a device for producing a relative rol ing movement between thisl wheelbearing puppet and the shaping tools transt e'slidin movement of the latter, of a common base or the guides of the'tool carriages, a seat in the frame `of the machine to receive this base, an adjusting device for giving an angular' displacement to said base Vsofas. to cause the elevation of the tool-carriage guides at once or together in the-same plane, and a locking device allowing of fixing the said base` in any positionto which it lmay bey adjusted, substantially as hereinbefore described.

3.y In a machine for cutting toothed wheels, especially bevel wheels, on

the rolling pri/nlab . flanks, movable carriages for these tools,

V curved recess in the frame of the machine .guides for these tool carriages, a wheel-bearguides for these tool carriages, a wheel-bearl ing pup et and a device for producing a relal tive' rol ing movement between this wlieell bearing puplpet and the shaping toolstransversely to t e sliding movement of the latter, of a common base for the guides of the tool carriages, a seat in the frame of 'the machine to receive this base, an adjusting device Jfor giving an angular displacement tosaid base so as to cause the elevation ofthe tool carriage guidesl at once or together in the same plane, and two locking shafts having eccentric ends engaging the said base and adapted tov allow of fixing the latter in any position to which it may be adjusted, substantially as hcreinbefore described. y

4. In a machine for cutting toothed wheels, i especially bevel wheels, on the rolling principle, the combination with two shaping tools together forming a tooth space with straight flanks, I movable carriages for these tools,

ing puppet and a device for producing a relative rolling` movement between this wheelbearing pu pet and the shaping tools transversely to t e sliding movement ci the latter, of a common base for the guides of the tool carriages, having the form of a cradle, a

to receivethis basev and an adjusting device for giving an angular displacementto said base so as to cause the elevationiof the toolcarriage guides at once' or together in the same plane, with the object of allowing an exact and simultaneous elevation of both tools, substantially as hereinbefore described. 5. In a machine for cutting toothed wheels, especially bevel wheels, on the rolling principle, the combination of two shaping tools, movable carriages for these tools, guides for these toolcarriages, a wheel-beariiig puppet, a controlling gear for this wheel-bearing puppet arranged so as to cause it to move transversely to the sliding movement of the shapv to the sliding movement the said guide levers ing tools, an auxiliary driving lmechanism adapted to produce the automatic and rapid return of the said wheel-bearing puppet and ing the said auxiliary driving mechanism with the obj ect of allowing the automatic and yrapid return of the wheel-bearing puppet,

substantially as hereinbefore described.

6. In a machine for cutting toothed Wheels especially bevel wheels, on the rolling principle, the combination of two .shaping tools,

`movable carriages for these tools, guides for these tool carriages, a wheel-bearing puppet, a controlling gear for this wheel-bearing puppet arranged so as to caus tt to move transversely of the shaping tools, two guide levers for guiding thewheel-bear-v ing puppet during its transverse movement,

two springs adapted to hold the wheel-bearing puppet in constant guide-relationwith and to compel it, with the aid of these latter, to rotate together with the wheel blank upon its own axes when it is moved transversely, a fixed bar to support said guide levers and anQ adjustable doublev swivel clamp for each of these guide levers, one element of which embracing the guide lever andthe other the said fixed bar, substantially as hereinbefore described. e I

`7 In a machine for cutting toothed wheels, especially bevel wheels on the rolling principle, the combination of a wheel-bearing puppet, means for producing a relative rolling movement between such puppet' and the` tools, said puppet having a mandrel and an adjustable, barrel through which and a washer on the mandrel is placed the Wheel blank, a rotary cylinder for receiving the barrel, a dividing device to which such cylinder is connected, means for carrying the cylinder and the dividing device and means for supportin said carrying means substantially as erein efore described.

ln witness whereo,l have hereunto si ned my name in the presence of two subscri ing witnesses;

GEORGES NARDIN. Witnesses:

DEAN B. MASON, 4-JOHN BAKER. 

